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Add a dark theme scoped to /docs — the reference-site minimum. A full site-wide inversion is unsafe: several marketing surfaces are deliberately dark (bg-ink text-paper — the hero closer, the terminal player, the LIVE ticker badge) and a naive token swap would flip them into light blocks. Mechanism: the surface/ink Tailwind tokens (paper, paper-deep, paper-edge, ink, ink-soft, ink-mute) now resolve through rgb(var(--c-*) / <alpha-value>) channels; :root carries the exact light values, so light output is unchanged. The dark values are set only on the .docs-theme wrapper, so the docs subtree re-themes while the shared nav and footer stay light. Default follows prefers-color-scheme; an explicit data-theme on <html> wins. Add an Auto/Light/Dark toggle in the date strip that persists to localStorage and only renders on docs routes (it would be a no-op control elsewhere). An inline pre-paint script applies the stored choice to avoid a theme flash. Contrast audit: hairlines, the col/double rules, the code-block border, and inline-code border route through a --hairline var that lightens in dark; the code panel raises to --code-bg (#17181e) above the page so it stays distinct; the CJK seal inverts to a light stamp with dark glyph (legible); the indigo accent is preserved. No mermaid/code blocks currently live in the docs pages; the code surfaces are handled for when they do. Tests: cd web && npm run lint && npm test && npm run check:facts && npm run build — all pass